LOS’, V. M.; ROITBERG, Ya. A. On the Sobolev problem in the complete scale of Banach spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 9, p. 1181–1192, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4714. Acesso em: 7 apr. 2025.